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PUMP.

(Application filed Aug. 22, 1899.) (No Model) 2 Sheets-Sheet 2.

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'srno'lritonrrron forming part of Letters Patent No. 649,750, dated May15, 1900.

Application filed August 22, 1899. 8erial No. 728,118. (No model.)

T0 to whom it may concern;

Be it known that I, DANIEL ARTHUR Quic- GIN, a subject of the Queen ofGreat Britain, residing in Blundellsands, near Liverpool, in the countyof Lancaster, England, have invented ccrtain new and useful Improvementsin Pumps, of which the following is a specification.

This invention relates to pumps intended chiefly for use in connectionwith evaporators for producing fresh water from sea-water. Suchevaporators require to be fed with seawater and also to be brined, so asto prevent undue concentration and the deposition of scale in theevaporator, and it is desirable that the brining should be continuous,and, further, that the brine should be diluted and cooled before beingdischarged overboard, as hot strong brine is apt to scale up thedischarge pipes and valves and to cause objectionable noise andvibration when discharged below water-level.

The object of my invention is to provide a pump of comparatively-simpleconstruction adapted to combine the above functions.

Figures I and II show a form suitable for evaporators worked at apressure above atmospheric pressure, and Fig. III shows a modificationsuitable for evaporators workin g at a pressure below atmosphericpressure. Fig. l is a sectional elevation on the line A A of Fig. II.Fig. II is a sectional elevation on the line B B of Fig. Land Fig. IIIis an elevation in medial section.

Throughout the drawings similar parts are indicated by the samereference-figures.

Referring first to Fi s. I and II, 1 is the pump-barrel. i3 is thepump-piston, and 3 is the pump-rod, passing through the usualstuffing-box a. 4 is the sea-suction or inlet branch. 5 is thebrine-inlet branch from the evaporator,fittod with an ordinarynon-return valve 13. 6 is the sea-suction valve. 7 and 8 arerespectively the feed-delivery valve and branch leading to theevaporator, and 9 and 10 are respectively the discharge-valve and branchfor the cooled and diluted brine and necting both sides of the pistonwhen the valve 7 is open. The branches 4 and5 in Fig, I and the branch 8in Fig. II, although, in front of the plane of section, are indicatedconventionally by dotted lines; The valve 0 is loaded by the spring 14 alittle in excess of the pressure in the evaporator, and it is to beunderstood that the feed-pipe enters the evaporator through acheck-valve, which is regulated, either automatically or otherwise, soas to maintain a constant water-level therein.

The action is as follows: Assuming the passage 11 and pocket 12 to befull of water, during the downstroke a quantity of sea-water equal tothe volume swept out by the upper or annular area of the piston entersthe pump through the valve (5. During the following upstroke a quantityof brine equal to the volume swept out by the pump-rod 3 en ters by thebrine-inlet, no discharge taking place. During the following downstrokethe action above the piston is the same as in the previous downstroke;but a quantity of water equal to the whole volume swept out by thepiston is now discharged, a portion passing as feed to the evaporatorand the remaim der being discharged overboard.

As the discharge to the evaporator is at the top end of the pocket andnear the incoming sea-water, while the brine enters and leaves near thebottom of the pocket, the feed to the evaporator is practicallyuncontaminated by the brine, while the latter mixes with and is cooledand diluted by the comparatively-large quantity of sea-water which isnot used as feed.

It will be understood that the quantity of brine removed depends uponthe volume swept out by the rod 3. The quantity of seawater with whichit is cooled and diluted depends upon the volume swept out by theannulus of the piston, and the quantity of feed delivered to theevaporator (its Water-level being maintained constant) is theevaporation plus the brine removed. If the water in the evaporator is tobe kept at, say, two thirtythirds of saltness, then the brine removedshould equal the normal evaporation and the feed should be double theevaporation. If

the rate of evaporation should diminish, the speed of the pump remainingnormal, the of feet would be to freshen up the water in the evaporator.

The form shown in Fig. III is intended to meet the difficulty generallyexperienced in connection with the suction of hot Water at a pressurebelow that of the atmosphere, owing to the formation of vapor. Theconstruction is mainly the same as that already described, the chiefdifferences being in the position and manner in which the brine entersthe pocket 12 and the addition of the back-pressure valve 17, and ascorresponding parts are figured as before no difficulty will be found intracing the action. The brine enters by the perforated pipe 15, Which isplaced right in the thoroughfare of the cold sea-water, so that thebrine is cooled immediately it enters the pump, and the formation ofvapor in the pocket 12 is prevented. The object of the valve 17 is tocontinuously maintain as low a pressure as possible in the pocket 12,and its weight is balanced by the light spring 16. There is but a singledischarge-passage 10 shown, the sea-water and brine being thoroughlymixed in this form of the apparatus.

. The discharge through this passage is usually delivered overboard towaste, although, if desired, a portion may be used for feed purposes, asthe diluted brine is not much salter than the sea. It will also benoticed that no spring load is now needed for the valve 9, the pressurein the evaporator being below that of the atmosphere.

Although I have for convenience of description specifically referred tothe application of my invention to an evaporator, it is to be understoodthat it is applicable also to other apparatus of the same class.

I claim 1. Apump comprising a pressure-chamber, a casing, a piston andpiston-rod movable in said pressure-chamber, a valved inletcommunicating with a chamber at the upper side of the piston above saidpressure-chamber, a valved inlet communicating with a chamber at thelower side of the piston said chamber being outside the piston-chamber,the upper and lower chambers being in communication, and a valveddischarge-passage.

2. A pump comprising a chamber or casing, a piston and piston-rod, avalved inlet communicating with a chamber at the upper side of thepiston, a valyed inlet communicating with a chamber at thelower side ofthe piston, the upper and lower chambers being in communication, and anupper and lower valved discharge-passage, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

DANIEL ARTHUR QUIGGIN.

I/Vitnesses:

R0131. A. SLOAN, JOSEPH E. HIRST.

